| 长江中下游成矿带岩浆岩体三维空间结构:来自重磁三维反演的证据 |
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| 引用本文： | 严加永,罗凡,张昆,赵金花,张永谦,王昊,付光明,祁光,徐蛲.长江中下游成矿带岩浆岩体三维空间结构:来自重磁三维反演的证据[J].地质科学,2019,54(3):853-875. |
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| 作者姓名： | 严加永 罗凡 张昆 赵金花 张永谦 王昊 付光明 祁光 徐蛲 |
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| 作者单位： | 中国地质科学院 北京 100037;中国地质调查局中国地质科学院地球深部探测中心 北京 100037;中国地质科学院 北京 100037;东华理工大学 南昌 330013 |
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| 基金项目： | 中国地调局地质调查项目;中国地调局地质调查项目;国家自然科学基金;国家自然科学基金;国家重点研发计划 |
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| 摘 要： | 长江中下游成矿带是我国重要的铁铜多金属矿产资源基地，燕山期中酸性岩浆岩对铜、铁、金等各种内生金属矿床的形成起着举足轻重的作用，识别和厘定岩浆岩体特别是隐伏岩体的三维分布形态对成矿动力学研究和深部找矿预测工作都有着重要意义。我们采用重磁三维物性反演技术，获得长江中下游成矿带磁化率和密度差三维模型，根据物性与岩性对应关系，识别和分析了区内岩浆岩体三维空间结构。推测了区内存在5个主要的岩浆活动中心，探讨了岩浆流动形式与轨迹。根据重磁三维反演反映的长江中下游岩浆岩三维分布特征，结合区域莫霍面、均衡重力异常和重磁多尺度边缘检测结果，以及区域成矿背景，预测了5个找矿远景区。结果表明，重磁三维反演技术是一种行之有效的岩浆岩体识别手段，通过对反演所得磁化率、密度分布情况的分析，可识别、圈定隐伏或半隐伏岩体，并可定量获取岩体三维形态特征，从而为寻找与火山岩、侵入岩体有关的金属矿产提供指示信息。
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| 关 键 词： | 长江中下游成矿带 重磁三维反演 岩浆岩体 |
| 收稿时间： | 2019-03-10 |
Three-dimensional spatial structure of plutons in the Middle and Lower Reaches of Yangtze River metallogenic belt： Evidence from three-dimensional inversion of gravity and magnetic |
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| Yan Jiayong Luo Fan Zhang Kun Zhao Jinhua Zhang Yongqian Wang Hao Fu Guangming Qi Guang Xu Yao.Three-dimensional spatial structure of plutons in the Middle and Lower Reaches of Yangtze River metallogenic belt： Evidence from three-dimensional inversion of gravity and magnetic[J].Chinese Journal of Geology,2019,54(3):853-875. |
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| Authors: | Yan Jiayong Luo Fan Zhang Kun Zhao Jinhua Zhang Yongqian Wang Hao Fu Guangming Qi Guang Xu Yao |
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| Institution: | Chinese Academy of Geological Sciences, Beijing 100037;China Deep Exploration Center, China Geologica Survey & Chinese Academy of Geological Sciences, Beijing 100037;School of Geophysics and Measurement-control Technology, East China Institute of Technology, Nanchang 330013 |
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| Abstract: | The Middle and Lower Reaches of Yangtze River metallogenic belt is one of the major copper resource bases in China. Yanshanian intermediate-acid magmatic rocks play an important role in the formation of various endogenous metal deposits such as copper, iron and gold. It is of great significance for the study of metallogenic dynamics and deep prospecting to identify and determine the three-dimensional distribution of magmatic rocks, especially concealed rock body. Based on gravity and magnetic three-dimensional physical inversion technique, a three-dimensional model of magnetic susceptibility and density difference in the Middle and Lower Reaches of the Yangtze River is obtained. Then according to the correspondence between physical properties and lithology, the three-dimensional structure of igneous rock body in the area is identified and analyzed. It is speculated that there are five main magmatic activity centers in the area, and the form and trajectory of magma flow are discussed. Finally, according to the three-dimensional distribution characteristics of the magmatic rocks in the Middle and Lower Reaches of the Yangtze River, combined with the regional Moho discontinuity, the isostatic gravity anomaly and the multi-scale edge detection results of the gravity and magnetic, and the regional metallogenic background, five prospecting prospects are predicted. The above results show that the gravity and magnetic three-dimensional inversion technique is an effective means for identifying magmatic rock mass. By analyzing the magnetic susceptibility and density distribution of the inversion, the concealed or semi-concealed rock mass can be identified and delineated. The three-dimensional morphological characteristics of the rock mass can be quantitatively obtained, thus providing indication information for finding metal minerals related to volcanic rocks and intrusive rocks body. |
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